【简答题】设数列{a n }是公比为q>0的等比数列,S n 是它的前n项和,若 ,则此数列的首项a 1 的取值范围为( ).
【单选题】FAQ: I have an idea I' d like to submit to TEC. How can I do that? We appreciate your interest in having TEC consider what may present a new technology, products or product modification. We would be h...
【简答题】SQL Server数据库提供了三种故障恢复模式,分别是_________、________和_________。
【简答题】已知等比数列 的首项为 ,公比为 q ,且有 ,求 的取值范围.
【单选题】— Would you like to spend the vacation in Paris with me? — I' d like to you pay for me.
【单选题】已知函数f(x)= 3 cosx+sinx+4的值域为M,在M中取三个不相等的数y 1 、y 2 、y 3 ,使之构成公比为q的等比数列,则公比q的取值范围为 ( )
【判断题】导游人员要讲究穿戴,其夏装要透气、吸汗。